The heaviest of the rain is expected to move through the Smoky Mountains Saturday night into Sunday morning with lingering showers in the afternoon.

According to NASCAR weatherman Brian Neudorff, the odds of racing the Monster Energy Cup Series Food City 500 are around 40 to 50 percent with possible delays. His odds for Saturday's Xfinity Series race happening are 50 to 60 percent.

Last year at Bristol, Kevin Harvick led 128 laps to win the weather-delayed Bass Pro Shops NRA Night Race nearly 24 hours after it was scheduled to finish. Spotty showers in Bristol still dampened Sunday's running, forcing several cautions, but drivers managed to get all 500 laps in.

NASCAR is hoping the weather will cooperate this weekend but the governing body does have a new policy saying it can move the green flag up an hour in case of inclement weather.